According to the different needs of the market, UV inks are also divided into UV inks printed directly on the surface of hard rubber and UV inks printed on the surface sprayed with UV varnish or PU varnish. The similarity between the two is that they can directly act on the surface of plastic materials. When silk screen printing or pad printing is required on the UV painted surface, the only choice is the latter. All the technical conditions of uv ink use pencil hardness. According to this requirement, we can use a pencil hardness tester. If it meets the requirements (generally 3-4h), it proves that the ink has been fully cured. Four detection methods to determine that uv ink is completely cured by uv lamp irradiation: 1. Use a pencil hardness test All the technical conditions of uv ink use pencil hardness. According to this requirement, we can use a pencil hardness tester. If it meets the requirements (generally 3-4h), it proves that the ink has been fully cured. 2. Test with the method of dropping solvent As mentioned above, there are also solvent-resistant items in the technical conditions of uv inks, because after the ink is completely cured, the internal molecular structure will change, and the conversion to double bonds will be completed, and the high curing will be completed. Floor. According to the performance of the solvent resistance, the propionic acid solution was dropped on the board surface for 2 minutes. If there is no change, it proves that the ink has been completely cured after being irradiated by the uv lamp. 3. Inspection by pressure method This method is derived from the detection method of paint. Choose a 500g weight with a flat bottom surface, put a few silk fibers on the uv cured surface, and then press the weight on the cotton fiber for 2 ~ 3min, then remove the weight, if the cotton fiber does not stick to the surface Prove that the surface is fully cured. 4. Appearance observation method The fully cured uv ink has a shiny surface, and there is no hairiness phenomenon, and there is no ghost image on the edge, which is also one of the important features to determine that the ink is completely cured by uv lamp irradiation. Of course, a lot of experience gained through the synthesis of uv ink performance, working environment, working conditions, equipment performance and application results in long-term production is a valuable technical asset. If we can combine the usual experience with the test results, To determine whether it is fully cured will be more accurate. Swim Ring,Inflatable Swim Ring,Inflatable Pool Water Swim Ring,Air Toy Swim Ring J&TZ CO.,LTD , https://www.inflatable-toy.com
4 detection methods for UV ink being completely cured